AIKIDO-2026-67396
cowlib is vulnerable to Allocation of Resources Without Limits or Throttling
87
High Risk
This Affects:
cowlibTL;DR
cowlib contains an uncontrolled resource consumption vulnerability in its HPACK and QPACK integer decoder. An unauthenticated attacker can send specially crafted HTTP/2 or HTTP/3 header fields containing excessively long prefixed integers, causing excessive memory allocation and garbage collection due to inefficient bignum processing. Repeated requests can exhaust server memory and lead to a denial of service.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
cowlib is vulnerable to Allocation of Resources Without Limits or Throttling in versions 2.0.0 - 2.18.0.
How to fix this
Upgrade the cowlib library to the patch version.
Links
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